[mutter] (2 commits) Non-fast-forward update to branch wip/carlosg/drop-device-idle-monitors

[Carlos Garnacho <carlosg src gnome org>]

The branch 'wip/carlosg/drop-device-idle-monitors' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  e37a87b... core: Do not update idle times for slave devices
  40e9ea7... backends: Drop meta_idle_monitor_get_for_device()

Commits added to the branch:

  e2ffde5... core: Do not update idle times for slave devices
  96578c1... backends: Drop meta_idle_monitor_get_for_device()